He was held at a police station in Plumstead, south-east London, but released on bail.

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Tunnelling is due to begin at the Plumstead site early next year.

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Miss Farma lived with Ms Foday in Plumstead in south-east London.

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Police arrested a man in Plumstead, south London, on 8 February.

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At the eastern end of the Crossrail route, archaeologists will work at four large tunnel entrance sites at Pudding Mill Lane, Victoria Dock, North Woolwich and Plumstead.

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Excavation at the Plumstead tunnel entrance began last month and results of analysis carried out on items found there recently confirmed they were made by humans, a Crossrail spokeswoman said.

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